Fix issue on package creation

Author: ThinkThoughtThunk

src/main/java/edu/cmu/oli/content/resource/builders/ContentPkgJsonReader.java

@@ -79,7 +79,9 @@ public static void parsePackageJson(ContentPackage mnfst, JsonObject pkgJson, bo
         mnfst.setOptions(new JsonWrapper(preferences));
 
         String language = pkgJson.has("language") ? pkgJson.get("language").getAsString() : null;
-        mnfst.setLanguage(language);
+        if (language != null) {
+            mnfst.setLanguage(language);
+        }
 
         mnfst.setErrors(new JsonWrapper(errors));
 

src/main/java/edu/cmu/oli/content/resource/builders/ContentPkgXmlReader.java

@@ -104,7 +104,9 @@ private static JsonObject parsePackageElement(Element pkgElmnt) throws BuildExce
 
         // Language
         Element pkgLanguageElmnt = pkgElmnt.getChild("language");
-        mnfstBuilder.addProperty("language", pkgLanguageElmnt == null ? null : pkgLanguageElmnt.getTextNormalize());
+        if (pkgLanguageElmnt != null) {
+            mnfstBuilder.addProperty("language", pkgLanguageElmnt == null ? null : pkgLanguageElmnt.getTextNormalize());
+        }
 
         return mnfstBuilder;
     }